Sign post



FIG. 1 is a perspective view of a sign post, incorporating the new design;

FIG. 2 is a side elevation view of the sign post of FIG. 1;

FIG. 3 is a front elevational view of the sign post of FIG. 1, the rear elevational view being a mirror image;

FIG. 4 is a top view of the sign post of FIG. 1; and,

FIG. 5 is a bottom view of the sign post of FIG. 1.

The broken lines are shown for illustrative purposes only and form no part of the claimed design. 

I claim the ornamental design for a "sign post," as shown and described. 